From: Petr Kulhavy <brain@jikos.cz>
To: intel-gfx@lists.freedesktop.org
Subject: i915: framebuffer compression causing occasional screen flickering
Date: Fri, 18 Sep 2015 00:03:32 +0200 [thread overview]
Message-ID: <55FB38B4.6030809@jikos.cz> (raw)
[-- Attachment #1.1: Type: text/plain, Size: 1499 bytes --]
Hi,
I would like to post a bug report for the Intel i915 driver, not sure if
this is the right place to do it.
The framebuffer compression feature is sometimes causing screen
flickering on my Asus UX501 laptop (i7-4720HQ with the HD4600 graphics).
Konsole out
I'm trying to reduce my battery usage and the kernel parameter
"i915.enable_fbc=1" saves about 2W actually!
I'm running Kubuntu 15.04 with mainstream kernel 4.1.0 and the latest
Intel drivers from 01.org version 1.2.0.
However I was experiencing the same problem also with previous versions.
The flickering itself is as follows. In most cases the picture (X with
KDE desktop) is OK. However with certain image patterns the screen
starts to flicker multiple times per second, sometimes it affects only
part of the screen, and it looks like the picture switching fast between
normal and a bit scrambled. The screen is still readable.
An example of an image pattern triggering the flickering Firefox with
youtube at the end of the video when you see the tiles with other
similar videos to watch. If I navigate to a different page the
flickering disappears. It is really picture dependent.
Not sure what it exactly is but with the enable_fbc=0 the problem
reliably disappears. So I believe it is related to the framebuffer
compression.
It would be really great if you could make the FBC working well also on
this HW. It saves a lot of battery.
Please let me know if you need some more information.
Thanks a lot
Petr
[-- Attachment #1.2: Type: text/html, Size: 2068 bytes --]
[-- Attachment #2: Type: text/plain, Size: 159 bytes --]
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/intel-gfx
reply other threads:[~2015-09-17 22:03 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=55FB38B4.6030809@jikos.cz \
--to=brain@jikos.cz \
--cc=intel-gfx@lists.freedesktop.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox