Em 16/08/2013 11:36, "John Hupp" <[email protected]
<mailto:[email protected]>> escreveu:
On 8/14/2013 6:20 PM, John Hupp wrote:
On 8/13/2013 4:47 PM, Nio Wiklund wrote:
On 2013-08-13 20:46, John Hupp wrote:
Here is a fresh summary (with one new result) of the problem on
machines
with integrated Intel graphics in which Adobe Flash Player 11.2
displays
only with shades of purple and green in a horizontally compressed
window.
(My current example is a Dell Dimension 2400 on Raring.)
In my testing with the Intel driver using its default acceleration:
- Flash 11.2 works on Quantal with the 3.5 kernel
- Flash 11.2 works on Raring with the 3.5 kernel **
- Flash 11.8 works on Raring with the 3.8 kernel (in Chrome)
- Flash 11.2 fails on Raring with the 3.8 kernel
- Flash 11.2 fails on Saucy with its default kernel
Disabling Flash *hardware* acceleration altogether (via R-click
in the
Flash display window: Settings: General tab) did not fix the problem.
Setting the Intel driver's acceleration method to UXA rather than its
default SNA *always* fixes the Flash problem, but causes a
garbled login
screen under LightDM that so far has no workaround.
I also tried one possible fix for the default Intel SNA acceleration
using the TearFree option. I created
/etc/X11/xorg.conf.d/20-intel.conf with contents:
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "AccelMethod" "sna"
Option "TearFree" "true"
EndSection
But this had no effect.
There was a helpful bug report on file at
http://bugs.launchpad.net/ubuntu/+source/linux/+bug/1178982.
(Note that
it was filed against Linux.) Workarounds posted there were to change
the Xorg acceleration method to UXA, or boot with an older
kernel. The
bug was closed only because the original poster didn't have
possession
of the machine anymore.
------------------------------------------------------------------------
** Flash sort of works in this case. The colors and window
dimensions
are normal. But there were other odd display-related effects.
Raring
booting to a a low-resolution desktop with the mouse pointer
locked. I
started Chromium via the keyboard and the flash video played long
enough
for me to see normal colors/dimensions, but then it locked up the
browser.
In my interest in testing under Raring with an older kernel, I
initially
tried to use a Live USB with persistence and follow the
instructions at
https://wiki.ubuntu.com/Kernel/MainlineBuilds for installing older
Mainline kernels. But this failed to install/run properly with
the Live
USB. And besides, I wanted to use Stock rather than Mainline
kernels.
So I installed a different hard drive, installed Quantal, then
upgraded
to Raring. I suppose if I had run Software Update under Quantal, I
would have gotten a 3.6 kernel to test as well. As it was, Raring's
Software Update did not install a 3.6 kernel, but only the kernel
updates proper to Raring.
------------------------------------------------------------------------
Looking at the above behavior of the "black box" without nearly
enough
technical knowledge, all I can see at this point is that there is an
adverse interplay between certain versions of the kernel, the Intel
driver, and Flash. (And I grant that I have not documented the
versions
of the Intel driver in the various cases, but no one has given me any
indication that the Intel driver version is an issue here.)
Hi John,
If I remember correctly, it does not work to install other kernels in
persistent live systems. You can update and or install other program
packages, but not kernels. An installed system on a USB drive will not
suffer from such problems.
Were you able to use that method to update kernels in Raring?
Best regards
Nio
Thanks, Nio.
Though I still haven't tried installing other kernels in an
installed system on a flash drive, today I used the method at
http://wiki.ubuntu.com/Kernel/MainlineBuilds to test other mainline
kernels on the temporarily-installed hard drive I describe above.
(I'd still like to know if there is a similar archive of stock
kernels somewhere, though perhaps all the stock kernels are right
there, identified by
http://kernel.ubuntu.com/~kernel-ppa/info/kernel-version-map.html
<http://kernel.ubuntu.com/%7Ekernel-ppa/info/kernel-version-map.html>
<http://kernel.ubuntu.com/%7Ekernel-ppa/info/kernel-version-map.html>.)
I found that Flash 11.2 works normally on Raring with the last 3.6
and 3.7 mainline kernels, but fails with the latest mainline kernel,
3.11.0-031100rc5.
Together with my earlier test results (above), this seemed to me to
provide enough indications to file a bug against the kernel, which I
have just done at
http://bugs.launchpad.net/ubuntu/+source/linux/+bug/1212455.
After a little back-and-forth concerning my bug report, one of the
Buntu kernel maintainers suggested that I move the bug upstream.
Step #1 in that process is to send a specifically formatted report
to the email list of the team for the relevant kernel module. So
after a little research, it seemed that this would be the Intel DRM
Driver.
The online archive of the thread begins with my email at
http://lists.freedesktop.org/archives/dri-devel/2013-August/043876.html
Happily for me as regards my time investment on this problem, but
perhaps unhappily as regards fixing the problem, Chris Wilson from the
Intel Open Source Technology Centre rendered this summary judgment in
a reply:
"It's a flash bug. They ignore the format of the Window that they
PutImage to. (Worse, they create an image of the right depth or else X
would reject the PutImage with a BadMatch and then render incorrect
pixel data into it.)"
If his assessment is on the mark, and if you have a PC with affected
Intel graphics that you want to display Flash content, it would seem
that the only recourse is to install a supported non-Intel video card.
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John,
I'm just wondering... Did you test the closed driver for Intel
integrated video?
https://01.org/linuxgraphics/
Just curious to see if it works better...
F.
