Public bug reported:
I am listening to music using Rhythmbox. To adjust the volume I use the
vol -/+ keys built in to my Microsoft Natural 4000 keyboard. This
arrangement worked fine in 9.10. A pop-up OSD in the top-right of the
screen appeared whenever I changed the volume. The full range of this
indicator (from empty to full) correctly corresponded to the full range
of silence to maximum volume output over my headphones.
Since upgrading to 10.04, the control behaves as follows. At the lowest
setting, I get no sound output, as expected. With one press of the vol+
key, the bar becomes one notch full (I note there appear to be 18
discrete values that the OSD can indicate). However, the sound output is
fairly loud: around half of the maximum output. After two presses of the
vol+ key, the bar is only about 10% full, but the sound output is at or
near the maximum (uncomfortably loud through my headphones). Successive
presses of vol+ continue to raise the indicated volume, but have no
discernible effect on the output volume.
I can watch what's going on in alsamixer while I press the vol -/+ keys.
(side note: alsamixer says 'Card: HDA ATI SB' and 'Chip: VIA VT1708S').
At volume zero, the bars marked Master Front, PCM and Front are all on
zero, and are marked as muted. On volume notch one (after one press of
vol+), those channels are marked as unmuted, and have respective values
0, 98, 60. After two presses 0, 98, 88. After three presses 6, 98, 100.
Successive presses just increase the Master Front value.
If I manually scale the PCM and Front columns using the arrow keys, I
get the expected response. i.e. perceived volume output is proportional
to the product of PCM and Front.
I'm using a Dell Inspiron 546. uname -a gives:
Linux alma 2.6.31-17-generic #54-Ubuntu SMP Thu Dec 10 17:01:44 UTC 2009
x86_64 GNU/Linux
The bits of lspci that I think are relevant:
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
01:05.1 Audio device: ATI Technologies Inc RS780 Azalia controller
Expected behaviour: output volume scales linearly with the scale
displayed on screen.
** Affects: ubuntu
Importance: Undecided
Status: New
** Description changed:
I am listening to music using Rhythmbox. To adjust the volume I use the
vol -/+ keys built in to my Microsoft Natural 4000 keyboard. This
arrangement worked fine in 9.10. A pop-up OSD in the top-right of the
screen appeared whenever I changed the volume. The full range of this
indicator (from empty to full) correctly corresponded to the full range
of silence to maximum volume output over my headphones.
Since upgrading to 10.04, the control behaves as follows. At the lowest
setting, I get no sound output, as expected. With one press of the vol+
key, the bar becomes one notch full (I note there appear to be 18
discrete values that the OSD can indicate). However, the sound output is
fairly loud: around half of the maximum output. After two presses of the
vol+ key, the bar is only about 10% full, but the sound output is at or
near the maximum (uncomfortably loud through my headphones). Successive
presses of vol+ continue to raise the indicated volume, but have no
discernible effect on the output volume.
I can watch what's going on in alsamixer while I press the vol -/+ keys.
+ (side note: alsamixer says 'Card: HDA ATI SB' and 'Chip: VIA VT1708S').
At volume zero, the bars marked Master Front, PCM and Front are all on
zero, and are marked as muted. On volume notch one (after one press of
vol+), those channels are marked as unmuted, and have respective values
0, 98, 60. After two presses 0, 98, 88. After three presses 6, 98, 100.
Successive presses just increase the Master Front value.
If I manually scale the PCM and Front columns using the arrow keys, I
get the expected response. i.e. perceived volume output is proportional
to the product of PCM and Front.
I'm using a Dell Inspiron 546. uname -a gives:
Linux alma 2.6.31-17-generic #54-Ubuntu SMP Thu Dec 10 17:01:44 UTC 2009
x86_64 GNU/Linux
The bits of lspci that I think are relevant:
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
01:05.1 Audio device: ATI Technologies Inc RS780 Azalia controller
-
- Expected behaviour: output volume scales linearly with the scale displayed on
screen.
+ Expected behaviour: output volume scales linearly with the scale
+ displayed on screen.
--
Adjusting volume gives uneven response
https://bugs.launchpad.net/bugs/579290
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