Harris composed on 2016-09-17 09:38 (UTC-0400):
Felix Miata wrote:
Harris composed on 2016-09-17 08:57 (UTC):
I just got a new Dell laptop to replace my former one that I ran Debian on with no issues
-- unfortunately with this one, the screen flickers when I have it at essentially the
next-to-highest brightness setting. I say "essentially" because it happens in
GNOME at the second-highest brightness level (using the keyboard up/down buttons)
although in other desktops (e.g., Xfce) I cannot reproduce the problem using these keys,
because Xfce does not have such fine increments when I use the keys -- the increments are
larger. However, I CAN reproduce the problem in Xfce (as well as in LXDE and MATE) if I
(a) reproduce the problem in GNOME using the keys, then (b) log out and log into one of
these other DE's without touching the brightness keys.
It appears that this is not a problem with the hardware, as I did a test of
reinstalling Windows 10 (which is what shipped with this laptop) and the
problem did not appear. However, now that I've learned that the brightness keys
produce different brightness percentages depending on the specific desktop
environment, I can't be sure that this does not happen in Windows.
Anyway, does anyone have any knowledge of this type of problem, and advice on
some potential solutions?
Here are my system specs:
Dell Inspiron 15 3000 Series
Intel Core i3-5005U Processor (3M Cache, 2.00 GHz)
4GB, 1600MHz, DDR3L memory
Intel HD Graphics 5500
15.6-inch HD (1366 x 768) Truelife LED-Backlit Display
- In GNOME Settings, the graphics is indicated as Gallium 0.4 on llvmpipe (LLVM
3.5, 256 bits)
I'm running Jessie 8.5.
Thanks very much in advance!
Give a driver switch a try:
# apt-get purge xserver-xorg-video-intel
# apt-get install xserver-xorg-video-modesetting
Next time, include output from 'lspci -v'.
Forgot to mention originally why:
Thanks Felix, but the problem is still there. I ran the purge and
install as you mentioned, but during the install it said that nothing
was installed as the package was already there. Here's how I restarted
invoke-rc.d gdm restart
I also restarted the system after that.
Here's the output from lspci -v :
00:02.0 VGA compatible controller: Intel Corporation Broadwell-U
Integrated Graphics (rev 09) (prog-if 00 [VGA controller])
Subsystem: Dell Device 06b0
Flags: bus master, fast devsel, latency 0, IRQ 64
Memory at a8000000 (64-bit, non-prefetchable) [size=16M]
Memory at b0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 4000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities:  MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
Kernel driver in use: i915
Bummer. Maybe if Google can't find you anything useful about Broadwell on
Linux, try asking on intel-...@lists.freedesktop.org or one of the web
forums, such as:
or a forum or mailing list that matches your preferred DEs, Gnome, XFCE LXDE,
Mate. Possibly this is one of those things that results from escalating
demands from the hardware. Maybe in TDE it wouldn't happen.
IIRC, flicker is a subject I've seen on the intel-gfx mailing list, so you
might start with its archive.
Stretch is so far along in development that it might be a good place to
start, especially if you have disk space available to add it rather than
Knoppix is the best of live media, Debian-based too. It's latest is newer
than Jessie, so it's probably worth burning one to see what happens.
"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/