Public bug reported:
Hi,
on ubuntu 14.04 with kernel 3.13.0-93 everything with the screen
resolution is fine. (beneath some undeterministic flickering at the
startup..)
On ubuntu 14.04 with kernel 4.2.0-42 the screen resolution is not working
properly.
It is too big. One could barely log in (because one could not click on the
preferred user to log in, because it is not visible on the screen).
Also on Ubuntu 16.04 with kernel 4.4.0-21, and "try ubuntu live"-mode,
the screen resolution is not working properly in the same manner.
Some testing showed that kernel 3.13 is using:
dmesg | egrep 'drm|radeon'
[drm] Initialized radeon 2.36.0 20080528 for 0000:02:00.0 on minor 0
which is ok.
while ubuntu 14.04 at kernel 4.2 is using:
[drm] Initialized radeon 2.43.0 20080528 for 0000:02:00.0 on minor 0
and ubuntu 16.04 at live mode, at kernel 4.4.0-21 is also using:
[drm] Initialized radeon 2.43.0 20080528 for 0000:02:00.0 on minor 0
On the failing kernels 4.2 and 4.4 xrandr says:
xrandr --prop
scaling mode: None
supported: None, Full, Center, Full aspect
*** while on kernel 3.13 and radeon 2.36.0 there is no output of:
"scaling mode: None" ***
lspci -nn | grep VGA
02:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] RV515 PRO [Radeon X1300/X1550 Series] [1002:7142]
if further logs are needed please tell me.
regards Linux Freak
** Affects: xorg-lts-transitional (Ubuntu)
Importance: Undecided
Status: New
** Tags: radeon rv515 series x1300 x1550
** Attachment added: "Logs where radeon is ok"
https://bugs.launchpad.net/bugs/1614442/+attachment/4723254/+files/logs%20Radeon_good_kernel_3.13.0-93
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https://bugs.launchpad.net/bugs/1614442
Title:
radeon 2.43.0 no scaling mode on RV515 PRO [Radeon X1300/X1550
Series]
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