got a word from a unity dev about what's happening with opengl 2.x
"Yes, the non-working codepath invokes a much more heavyweight Gaussian
blur convolution function. The working codepath also downscales the
image before blurring.
An example of the shader code for the broken pass is as follows.
"varying vec4 v_tex_coord;
uniform sampler2D tex_object;
uniform vec2 tex_size;
#define NUM_SAMPLES %d
uniform float weights[NUM_SAMPLES];
uniform float offsets[NUM_SAMPLES];
void main()
{
vec3 acc = texture2D(tex_object, v_tex_coord.st).rgb*weights[0];
for (int i = 1; i < NUM_SAMPLES; i++)
{
acc += texture2D(tex_object, (v_tex_coord.st+(vec2(0.0,
offsets[i])/tex_size))).rgb*weights[i];
acc += texture2D(tex_object, (v_tex_coord.st-(vec2(0.0,
offsets[i])/tex_size))).rgb*weights[i];
}
gl_FragColor = vec4(acc, 1.0);
}";
The NUM_SAMPLES in this case is 10."
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https://bugs.launchpad.net/bugs/1222602
Title:
[regression] [gen3] Mesa 9.2 makes Unity unusable on Atom class
hardware and 943/945 graphics controllers
Status in Mesa:
Confirmed
Status in Release Notes for Ubuntu:
New
Status in “mesa” package in Ubuntu:
Fix Committed
Status in “nux” package in Ubuntu:
Fix Released
Status in “unity” package in Ubuntu:
Invalid
Bug description:
After the upgrade to Mesa 9.2.0 unity is barely usable.
Dash, Alt+Tab switcher and Alt+F2 command line shows in more than 1 minute,
using 100% cpu.
A downgrade to mesa 9.1.6-2ubuntu2 restores full performance.
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: libgl1-mesa-glx 9.2-1ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-5.11-generic 3.11.0
Uname: Linux 3.11.0-5-generic i686
.tmp.unity.support.test.0:
ApportVersion: 2.12.1-0ubuntu3
Architecture: i386
CompizPlugins: No value set for
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Mon Sep 9 01:51:45 2013
DistUpgraded: 2013-09-08 20:36:47,811 DEBUG enabling apt cron job
DistroCodename: saucy
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
Intel Corporation Mobile 945GSE Express Integrated Graphics Controller
[8086:27ae] (rev 03) (prog-if 00 [VGA controller])
Subsystem: Micro-Star International Co., Ltd. Device [1462:0110]
Subsystem: Micro-Star International Co., Ltd. Device [1462:0110]
InstallationDate: Installed on 2013-09-07 (1 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release i386 (20130424)
MachineType: MICRO-STAR INTERNATIONAL CO., LTD U90/U100
MarkForUpload: True
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=it_IT.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-5-generic
root=UUID=674329c8-d0a6-4954-89c0-72821cfa0ba8 ro quiet splash vt.handoff=7
SourcePackage: mesa
UpgradeStatus: Upgraded to saucy on 2013-09-08 (0 days ago)
dmi.bios.date: 12/01/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.3
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: U90/U100
dmi.board.vendor: MICRO-STAR INTERNATIONAL CO., LTD
dmi.board.version: Ver.001
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 10
dmi.chassis.vendor: MICRO-STAR INTERNATIONAL CO., LTD
dmi.chassis.version: Ver.001
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr4.6.3:bd12/01/2009:svnMICRO-STARINTERNATIONALCO.,LTD:pnU90/U100:pvrVer.001:rvnMICRO-STARINTERNATIONALCO.,LTD:rnU90/U100:rvrVer.001:cvnMICRO-STARINTERNATIONALCO.,LTD:ct10:cvrVer.001:
dmi.product.name: U90/U100
dmi.product.version: Ver.001
dmi.sys.vendor: MICRO-STAR INTERNATIONAL CO., LTD
version.compiz: compiz 1:0.9.10+13.10.20130828.2-0ubuntu1
version.libdrm2: libdrm2 2.4.46-1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.2-1ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.2-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.14.2.901-2ubuntu4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu6
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.14-4ubuntu3
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau
1:1.0.9-2ubuntu1
xserver.bootTime: Mon Sep 9 01:46:55 2013
xserver.configfile: default
xserver.errors:
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
product id 1001
vendor HSD
xserver.version: 2:1.14.2.901-2ubuntu4
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