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List:       kde-bugs-dist
Subject:    [Bug 276860] KWin crashed after nvidia driver installed
From:       <progopis () gmail ! com>
Date:       2011-07-01 5:52:06
Message-ID: E1QcWe6-0003iP-LI () bugs ! kde ! org
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https://bugs.kde.org/show_bug.cgi?id=276860





--- Comment #2 from  <progopis gmail com>  2011-07-01 05:52:06 ---
>Afaik "Optimus" is NOT supported on Linux.

Ok, sir. But where did you seen in my message, that "Optimus" is turned on?
NVIDIA has no own engine for output. NVIDIA chip works with Intel together,
because NVIDIA is just works as accelerator for Intel (special mobile version
with 'M' letter in the name of model). My current configuration is not Optimus,
because it is based on a dynamic switching video cores, depending on
conditions, while I have both cores are working all the time. I tried run
desktop effects on Intel hardware without NVIDIA and it ended in failure. I
installed 'bumblebee' special package and desktop effects will turn on
automatically.

Also, it's not possible for xorg switch video device by configuring xorg.conf.
X server can not switch between graphics cards with Optimus scheme. Just look
here:

xorg.conf:
...
Section "Device"
    Identifier     "Device0"
    Driver         "intel"
    VendorName     "Intel GMA 3150"
    BusID       "PCI:0:2:0"
EndSection
...

This is the only section 'Device' in my xorg.conf. Nothing about NVIDIA (but
you can not just replace the parameters BusID and Driver, as well as set
IsolateDevice to enable NVIDIA). Now look here:

lsmod | grep -i -P "nv|i915"
nvidia              10718100  0 
i915                  514985  5 
drm_kms_helper         42136  1 i915
drm                   227495  6 i915,drm_kms_helper
i2c_algo_bit           13400  1 i915
video                  19438  1 i915

Both drivers loaded and works. Unfortunately this is a "hack", so that even the
nvidia-config "thinks" that the NVIDIA driver is not used. Also I will try
'/usr/local/bin/bumblebee-disablecard' script and report if it becomes known
anything else.

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