How to keep the audio profile at A2DP while using a mic with Bluetooth headset? (Push-to-talk) I have a CEL-TEC F5A headset. The spec says:      Bluetooth 4.0, profiles: Headset, Hands free, A2DP, AVRCP/HSP/HFP   It plays nicely with High Fidelity Playback (A2DP sink) profile.  When I want to switch audio input to the headset's microphone, the output profile automatically changes to Headset Head Unit (HFS/HFP) and the quality is terrible - like 8bit sound or something. When I switch it back to A2DP, the input is back to desktop mic.  I've read few of other questions and seems A2DP is expected not to support input, right? But the HFP part in HFS/HFP is High Fidelity Playback I guess? That sounds like it could work as a headset and still not sound like 1950's phone.  How could I simplify switching between the profiles so that it is HFS/HFP when I talk and A2DP when I listen? E.g. as a push-to-talk.  Ubuntu 17.10, no sound customization IIRC, everything latest.   My output:  $ pactl list cards Card #0         Name: alsa_card.pci-0000_00_03.0 ...  Card #4         Name: bluez_card.00_19_5D_25_6F_6C         Driver: module-bluez5-device.c         Owner Module: 30         Properties:                 device.description = "F5A"                 device.string = "00:19:5D:25:6F:6C"                 device.api = "bluez"                 device.class = "sound"                 device.bus = "bluetooth"                 device.form_factor = "headset"                 bluez.path = "/org/bluez/hci0/dev_00_19_5D_25_6F_6C"                 bluez.class = "0x240404"                 bluez.alias = "F5A"                 device.icon_name = "audio-headset-bluetooth"                 device.intended_roles = "phone"         Profiles:                 a2dp_sink: High Fidelity Playback (A2DP Sink) (sinks: 1, sources: 0, priority: 10, available: yes)                 headset_head_unit: Headset Head Unit (HSP/HFP) (sinks: 1, sources: 1, priority: 20, available: yes)                 off: Off (sinks: 0, sources: 0, priority: 0, available: yes)         Active Profile: a2dp_sink         Ports:                 headset-output: Headset (priority: 0, latency offset: 0 usec, available)                         Part of profile(s): a2dp_sink, headset_head_unit                 headset-input: Headset (priority: 0, latency offset: 0 usec)                         Part of profile(s): headset_head_unit   The problem here is not that the microphone does not work, but rather that the audio quality worsens when it is activated.
Headphones microphone is not working I'm trying to use my headphones with my Ubuntu 13.10. My headphones are Nokia BH-905i, which can be connected via Bluetooth or green+pink wires.  If I use bluetooth, voice quality is terrible or microphone doesn't work. If I try to choose "Headset" option from In and Out tabs in Sound Settings, they're disabling each together.  In Out tab, I'm using "High sound quality A2DP", because it betters voice quality.  How could I get my microphone working? Sound out works fine.
I'm writing a math paper in LaTeX and for math formulas I'm just using $$math formula$$. Is is possible to numerate formulas? Or do I have to you use some specific commands such as align? Why weren't everyone on Haruun Kal made a Jedi? Which SUSY models are affected by the recent LHCb result? The LHCb has recently  the observation of $B_s \rightarrow \mu^+ \mu^-$ with a branching ratio that agrees with the Standard Model (SM). There are many blog posts about it (See: ).  The result initiated a debate over its implication on Supersymmetry in general, which I don't want to discuss here. But it certainly affects some Supersymmetric models that may have a different prediction than that of the SM.   My questions are,   Which models in particular are affected (or variants of models)? What is the MSSM status? The NMSSM? Does the result affect some of the parameter space of a particular model, or does it rule out an entire model/or variant of a model? I would like to make a sum of all dropdown values into a label text box. I am using following formula, but I do not understand where am I going wrong. Can anyone assist? I have also added a screenshot if that helps anyhow. Note: scores is the table name the dropdown values feed from. Sum(scores, Dropdown3.Selected.Value + Dropdown3_1.Selected.Value + Dropdown3_2.Selected.Value) Yesterday I read Modern English:A Practical Reference Guide written by Marcella Frank, and she gives a paradigm about tenses on page 50. The page shows tenses in active voice and passive voice; she said these four tenses are exceedingly rare:   shall/will be being offered has/have been being offered had been being offered shall/will have been being offered   Why are these tense so rare? Are they normally replaced by other tenses? I receive the error 'grub-install /dev/sda failed' while attempting to install Ubuntu as the computer's only OS. I am attempting to install Ubuntu on a box which was previously running Windows 7.  I have also experienced the dreaded "Unable to install GRUB" error.  I am not attempting to dual boot. I have previously run a Windows boot disk and removed all existing partitions.  If I run the Ubuntu 12.04 install CD and click install after the config screens, I get the error   Executing 'grub-install /dev/sda' failed. This is a fatal error. (It is the same error as this question: )  All the questions I've read while looking for a solution are related to dual boot.  I'm not interested in dual boot, I'm after a clean out the box Ubuntu install. How can I achieve this?  (For my sanity, please use very simple instructions when responding. I don't claim to have any talent either for linux or as a sysadmin)    Additional details copied from comments dated: 2012-05-29 ~15:19Z  After booting from the CD, clicking Try Ubuntu, and then sudo fdisk /dev/sda I get fdisk: unable to seek on /dev/sda: Invalid argument  sudo fdisk /dev/sdb gives   Device contains neither a valid DOS partiion table, nor Sun, SGI or OSF disklabel.  Building a new DOS disklabel with disk identifier 0x15228d1d.  Changes will remain in memory only until you decide to write them.  After that of course, the previous content won't be recoverable.  Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite).  Command (m for help):   I should add the Live CD desktop is graphically bad. I've got missing parts of programs and the terminal occasionally reflects to the bottom of the screen. But I can't imagine this is related. seem to be well-regarded for their versatility and accuracy of metering.  What puzzles me about them is how can they account for the different light transmittance of different lenses? It's easy for an in-camera metering system that meters  so any peculiarity in transmittance is already applied to light when it reaches the metering sensor. But a standalone meter does not have the privilege of looking at the world through the lens it meters for. I tried looking it up in  and , but this issue was not touched upon at all.  This leaves several variants how it could be handled -   light meter uses  for aperture display/input, and photographer is expected to perform the adjustments to and from  (which are used by cameras); light meter assumes some median transmittance of lenses of its era, and automatically accounts for that; photographers simply ignore the matter - even a 75% transmitting lens will be off only by about half a stop, no big deal; each light meter used is expected to know that you have to dial in some exposure compensation to account for the light loss; ...   So how does it work in real world? (PHP) Is handling a form submission on the same page more/less/equally good as handling on a separate page? a better way to express "an idea/thought suddenly came to me" What are some grandiloquent, or simply better, ways of expressing "an idea/thought suddenly came to me", or "an idea/thought struck me", or "I was struck by an idea/thought"? Can I change a user's keyboard input? How do you make a deep copy of an object? It's a bit difficult to implement a deep object copy function. What steps you take to ensure the original object and the cloned one share no reference? software updater failed to download repository information When I run software updater it says that it failed to download repository information and to check Internet connectivity.  I have Internet connectivity.  How do I fix this?  editing to add content of sources,list:  sorry I can't figure out how to paste in the content of sources.list without making a huge mess.  Some of it previews as really large bold print.  I tried to follow the block quoting and code rules but it is a huge mess anyway. Is it possible to serialize and deserialize a class in C++? If I play a spell with {X} in the mana cost, and I have a card out that reduces the casting cost by 2 generic mana, what happens to the X? Does it start at -2?  For example: I have  in play. If I play  for just 1 blue mana, do we draw 2 cards? How do I create my own URL protocol? (e.g. so://...) I have seen:   http://www... ftp://blah.blah... file://blah.blah... unreal://blah.blah... mailto://blah.blah...   What is that first section where you see http and the like called?  Can I register my own? What is the difference between #include  and #include "filename"? In the C and C++ programming languages, what is the difference between using angle brackets and using quotes in an include statement, as follows?   #include &lt;filename&gt;  #include "filename" Can $\frac{\sqrt{3}}{\sin20^{\circ}}-\frac{1}{\cos20^{\circ}}$ have two values? Product of binomial coefficient as a basis I understand that \bf and \it are now obsolete in LaTeX and that \textbf and \textit are proper, as they produce more sophisticated (in particular, cumulative and properly kerned) changes to font style. I have read the  and I understand the rules and their reasons, as well as the several other commands that are affected.  However, I find it convenient to use LaTeX for notetaking during lectures, and in that rushed environment, shortening a command by any number of keystrokes helps keep me from falling behind. \bf and its two-letter kin are still very useful to me for that reason, and once a presentation is finished I can go through and replace all appearances of \bf et al. with \textbf et al.  My question is this: is there a plan eventually to replace the short font style commands like \bf with the implementations of \textbf etc. some day, or should I expect \bf always to remain in existence but obsolete, for reasons of backward compatibility with original TeX? Original TeX has been greatly improved on in countless ways, but in the heat of transcription I sometimes miss its conciseness. Is there any standard notation for specifying dimension of a matrix after the matrix symbol? I want to explicitly specify dimension of matrices in some expressions, something like   $$\boldsymbol{A}_{m \times n} \boldsymbol{B}_{n \times m} = \boldsymbol{C}_{m \times m} \, .$$  Is there any more or less standard notation for this?    While this notation is generally unambiguous, I think it become ambiguous, for example, in the following case. Suppose that I have some column or row vector which is conjugate transpose of correspondingly row or column vector. If I write it in the following way  $$\boldsymbol{A}_{n \times 1}^{\dagger} \, ,$$ we can have 2 different interpretations:   matrix $\boldsymbol{A}_{n \times 1}$ is $n \times 1$ column vector and by $\boldsymbol{A}_{n \times 1}^{\dagger}$ I'm referring to its conjugate transpose which is $1 \times n$ row vector; matrix $\boldsymbol{A}_{n \times 1}^{\dagger}$ itself is $n \times 1$ column vector which is conjugate transpose of $1 \times n$ row vector $\boldsymbol{A}$.