Bug#585777: Radeon gamma bug, display too bright when using VGA output

[Alex Deucher]

On Tue, Apr 26, 2011 at 4:41 PM, Andrew Rule <a.rule at freeuk.com> wrote:
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> On 26/04/11 20:39, Alex Deucher wrote:
>> On Tue, Apr 26, 2011 at 3:56 AM, Andrew Rule <a.rule at freeuk.com> wrote:
>> Hi,
>>
>> I also have this problem.  It appeared for me when I upgraded from Xorg
>> 1.7.x to Xorg 1.9.5
>>
>> I am using
>> "ATI Radeon Mobility 9200 (M9+) 5C63 (AGP)" (ChipID = 0x5c63)
>> as X reports it, and
>> Linux amos 2.6.38.3 #2 SMP PREEMPT Sat Apr 16 22:03:19 BST 2011 i686
>> GNU/Linux
>> from kernel.org
>>
>> I tried setting Gamma in /etc/X11/xorg.conf, but it didn't pick it up.
>> If I run xgamma after logging in to X, it *does* change the gamma - but
>> still not enough.  So I can set Gamma to 0.3 in the file, but if I set
>> it using xgamma, it actually darkens the screen somewhat - but it is
>> still not right.  Output from xgamma:
>> -> Red  0.300, Green  0.300, Blue  0.300
>> <- Red  0.300, Green  0.300, Blue  0.300
>>
>>
>>> It's not the gamma, but the dac adj values.
>>
>>
>> I tried
>> radeontool regset DAC_MACRO_CNTL 0x00000808
>> but it didn't work for me.  (Perhaps that is not a surprise, I am using
>> a tower PC, not a laptop.)
>>
>>> You are probably using the secondary dac.  The dac adjust values for
>>> the TV dac are in
>>> TV_DAC_CNTL.
>>
>>
>> Perhaps I should not mention this here, but X is also unstable for me
>> under KDE now, so I'm using sawfish for the time being.  Specifically,
>> it crashes when notifications popup in KDE.
>>
>> Another problem I have noticed is that when scrolling a window under
>> another window, the contents of the lower window smudges.  O, and popup
>> hints from firefox come up in the wrong place for the search box.
>>
>> And, as you can see from the attached files, I am not using KMS -
>> because I found that unstable since upgrading the kernel from 2.6.36.1
>> to 2.6.38.x (although previously the virtual terminals had not worked at
>> all, and now they do occasionally; but it was stable under X, now it is
>> not.)
>>
>>> What is unstable with KMS?  KMS is more likely to be fixed that UMS at
>>> this point.  If you want to fix UMS, you'll probably have to bisect
>>> xf86-video-ati to find out what change caused the breakage.  Your time
>>> would be better off spend bisecting to see what caused the instability
>>> with KMS.
>>
>>> Alex
>
> So your saying that this problem with the dac adj values is totally
> dependant on whether I'm using KMS or UMS?  And I should research
> further and report it as another bug?  Or try Xorg 1.9.5 using KMS and
> report any bugs that happen with them?

No.  I'm saying UMS is slowly being deprecated, so if you are seeing a
problem, KMS is more likely to get fixed.  It should work fine with
either KMS or UMS, but it has apparently regressed on your card at
least with UMS.

Alex

>
>>
>>
>> Please ask further questions if you need.  I'm gonna try downgradeing X,
>> cos I'd like to have a screen I can look at pictures on :-)
>>
>> Sincerely,
>>
>> Andrew Rule
>>
>> PS please tell me if I should open a new bug for some of this, I wasn't
>> sure.  But the gamma stuff seemed so similar I thought it might be the
>> same bug.
>>
>> PPS: package versions:
>> firmware-linux/testing uptodate 0.29
>> libc6/testing uptodate 2.11.2-11
>> libdrm-radeon1/testing upgradeable from 2.4.23-3 to 2.4.24-2
>> libdrm2/testing upgradeable from 2.4.23-3 to 2.4.24-2
>> libpciaccess0/testing uptodate 0.12.1-1
>> libpixman-1-0/testing uptodate 0.21.4-2
>> libudev0/testing upgradeable from 166-1 to 167-3
>> xserver-xorg-core/testing uptodate 2:1.9.5-1
>> xserver-xorg-video-radeon/testing uptodate 1:6.14.1-1
>>
>> I upgraded to:
>> firmware-linux/testing uptodate 0.29
>> libc6/testing uptodate 2.11.2-11
>> libdrm-radeon1/testing uptodate 2.4.24-2
>> libdrm2/testing uptodate 2.4.24-2
>> libpciaccess0/testing uptodate 0.12.1-1
>> libpixman-1-0/testing uptodate 0.21.4-2
>> libudev0/testing upgradeable from 166-1 to 167-3
>> xserver-xorg-core/testing uptodate 2:1.9.5-1
>> xserver-xorg-video-radeon/testing uptodate 1:6.14.1-1
>>
>> with no obvious change, certainly not to the gamma issue.
>>>
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