[Bug 27478] Radeon gamma bug, display too bright when using DVI-VGA adapter

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27478

--- Comment #9 from Alex Deucher <agd5f at yahoo.com> 2010-04-06 07:36:21 PDT ---
(In reply to comment #8)
> I have an older video card (lspci says)
> ATI Technologies Inc Radeon RV100 QY [Radeon 7000/VE]
> 
> Here is the output of radeontool regmatch TV_DAC_CNTL:
> TV_DAC_CNTL (088c)    0x07480043 (122159171)

that looks correct.  Does:
radeontool regset TV_DAC_CNTL 0x07280043
help?

> 
> You also said you wanted to see the vbios, but I can figure out how to get that
> information. Is that something I need to look at during boot time, or is that
> something I can get any time?
> 

Any time.

> Please let me know if I can do anything else to help. I am by no means an
> expert, but I can test stuff out if I'm given good enough instruction.

You'll need the pci bus id from lspci, e.g.,
01:05.0 VGA compatible controller: ATI Technologies Inc RS690
^^^^^^^
It will have some leading zeros in sysfs.

cd /sys/bus/pci/devices/<pci bus id>
echo 1 > rom
cat rom > /tmp/vbios.rom
echo 0 > rom

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