radeon mobility x1600 broken since 3.4.0-rc6 (bisected)

[Hausensteiner Keg]

After some more experimenting with different versions, I'm getting odd 
results. So feel free to ignore this report..

FYI, what I see is:
* as noted, commits before bb6355 work fine (ie up to 3.4-rc6).
* including commit bb6355, graphics freeze on the first transition after 
grub (Plymouth?)
* the very next commit makes the (plymouth?) splash screen work, but the 
greeter screen display is corrupted; ctrl-alt-f2 works - if pressed 
immediately
* this situation continues up until release v3.5^. But building v3.5 
itself works perfectly! Presumably I've done something wrong here..
* v3.6-rc3 displays the splash (plymouth?) screen fine, but instead of a 
greeter screen, screen goes blank.

I'll try to make some more sense of this in the next few days - but 
suggestions are welcome.

Sorry if I'm posting this in the wrong place - let me know if I should 
create a bugzilla entry or whatever.

Regards,
Simon

On 25/08/12 19:39, Hausensteiner Keg wrote:
> Hi,
>
> I updated the kernel on an Ubuntu 12.04 (32-bit) install, and graphics 
> immediately broke. Bisection points to:
>
> commit bb635567291482a87e4cc46e6683419c1f365ddf
> Author: Jerome Glisse <jglisse at redhat.com>
> Date:   Wed May 9 15:34:46 2012 +0200
>
>     drm/radeon: convert fence to uint64_t v4
>
>
> Radeon graphics are still broken for me in both 3.5.2 (from 
> linux-stable) and 3.6.3-rc3 - though the symptoms appear to be 
> slightly different.
>
> I'm currently running a kernel built from the commit before the above, 
> and everything seems sane and stable.
>
> I'm happy to do any tests you might find helpful..
>
> == Symptoms
>
> When booting with above commit, grub works fine but immediately upon 
> attempt to switch graphics mode a solid green bar appears across the 
> screen. System does not respond to ctrl-alt-f2. Very repeatable.
>
> When booting with later releases (eg 3.5.2), the greeter screen is 
> displayed - sometimes correctly, sometimes with minor graphics 
> corruption. Immediately switching to a virtual terminal works. However 
> any attempt to move the mouse or log in via the greeter screen causes 
> graphics corruption and system no longer responds. Also consistently 
> repeatable.
>
> == OS details:
>
> Ubuntu 12.04 32-bit (default kernel 3.2.0-29).
>
> == System details:
>
> HP/Compaq nc8430 laptop
>
> $glxinfo | grep renderer ==> OpenGL renderer string: Gallium 0.4 on 
> ATI RV530
>
> $ lsmod | grep radeon
> radeon                815703  3
> ttm                    71375  1 radeon
> drm_kms_helper         32563  1 radeon
> drm                   220833  5 radeon,ttm,drm_kms_helper
> i2c_algo_bit           13197  1 radeon
>
> $ lspci | grep VGA
> 01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee 
> ATI M56P [Radeon Mobility X1600]
>
> $ xrandr
> Screen 0: minimum 320 x 200, current 1680 x 1050, maximum 8192 x 8192
> VGA-0 disconnected (normal left inverted right x axis y axis)
> LVDS connected 1680x1050+0+0 (normal left inverted right x axis y 
> axis) 331mm x 207mm
>    1680x1050      60.1*+
>    1400x1050      60.0
>    1280x1024      59.9
>    ....
>
> Regards,
> Simon