Re: How to properly install Radeon drivers for Sid
Mostafa Shahverdy composed on 2016-06-04 10:16 (UTC+0430):
On Thu, Jun 02, 2016 at 11:54:00PM -0400, Felix Miata wrote:
Mostafa Shahverdy composed on 2016-05-30 17:53 (UTC+0430):
> I have an ultra wide monitor that supports 2560x1080.
> While I have a Radeon 5450 graphic card, running Debian Sid, I only can get 1920x1080.
...
I suggest you try purging xserver-xorg-video-ati and xserver-xorg-video-radeon.
I couldn't get Stretch's radeon to do 2560x1080 with HD5450 either, but
2560x1080 WFM with the built-in/native Xorg modeset driver, the recommended
FOSS driver for non-ancient gfxchips in xserver versions >1.16.x:
http://fm.no-ip.com/SS/KDE/d9tde-desktop-2560x1080.jpg
I did. Now I get a better video (no glitches while playing movies). But
still I can get only 1920x1080.
I have to mention that using a DVI cable I can get 2560x1080, but it is
very very noisy.
I don't know, but were it not that in Windows 2560x1080 works OK I would
suspect this meant you might have cables that aren't up to the task, or a
possibly borderline defective HD5450. Maybe Linux, either kernel or driver or
Xorg, is less efficient and needs higher quality cabling? How long are the
cables you tried? What gauge is the HDMI cable's wires? Which version does
your HDMI cable support, 1.1? 1.2? 1.3? 1.4?
Note that AIUI, DVI and HDMI video signals are the same, the main difference
that I'm aware of between DVI and HDMI being that a DVI cable omits carriage
of audio.
Video noise on DVI could be a software issue, DE/theme or driver or server.
If it's theme or DE, disabling compositing or switching themes might be
workarounds.
Possibly someone might be able to spot a remaining issue if you share this
latest Xorg.0.log and .xsession-errors from using the HDMI cable and modeset
driver - maybe even me. It could be a custom xorg.conf file could work around
an EDID shortcoming that the Windows driver avoids.
Booting some other distribution's live media might be telling. It could be
that your particular hardware in combination with Sid uncovers an Xorg or
kernel bug that does not manifest elsewhere. Try the Knoppix 7.6 DVD or one
of openSUSE's (42.1, kernel 4.1.21/server 1.17.2 or Tumbleweed, kernel
4.6.0/server 1.18.3) or Fedora's latest (v23, kernel 4.5.5/server 1.18.3 via
updates, or v24 beta, kernel 4.5.5/server 1.18.3).
I don't think I know enough to suggest any more except to refer to this very
thread[1] by starting a thread on the xorg-driver-ati@lists.x.org and/or the
xorg@lists.x.org list.
[1] https://lists.debian.org/debian-user/2016/05/msg01057.html
--
"The wise are known for their understanding, and pleasant
words are persuasive." Proverbs 16:21 (New Living Translation)
Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!
Felix Miata *** http://fm.no-ip.com/
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