On Mon, 28 Aug 2023, Ahmad Nouralizadeh wrote:
The laptop model is `Asus N501JW` running `Ubuntu 18.04`. The discrete GPU is
`GeForce GTX 960M`.
The link below says that by default the system uses `Intel HD graphics` (the
iGPU) and using the discrete GPU requires a proprietary driver! Does
The laptop model is `Asus N501JW` running `Ubuntu 18.04`. The discrete GPU is
`GeForce GTX 960M`.
The link below says that by default the system uses `Intel HD graphics` (the
iGPU) and using the discrete GPU requires a proprietary driver! Does this mean
that having `nouveau` is not enough?
https
On Mon, 28 Aug 2023, Ahmad Nouralizadeh wrote:
Is it possible to prevent the Xserver from using the iGPU and only use the
discrete GPU. I found no BIOS options for this. Why should the two GPUs work
simultaneously?
Urmm.. BIOS is the wrong place to look for this - if you are trying to
Is it possible to prevent the Xserver from using the iGPU and only use the
discrete GPU. I found no BIOS options for this. Why should the two GPUs work
simultaneously?
On Sun, 27 Aug 2023, Ahmad Nouralizadeh wrote:
Thanks Alan and Vladimir!These are very effective clues to help me understand
the whole architecture, but I will need some experiments! :D
I may continue with this thread later to ask questions about the main problem
discussed here (i.e., turn
Thanks Alan and Vladimir!These are very effective clues to help me understand
the whole architecture, but I will need some experiments! :D
I may continue with this thread later to ask questions about the main problem
discussed here (i.e., turning off the screen), if I find my approach feasible!
On Sun, 27 Aug 2023, Ahmad Nouralizadeh wrote:
Perhaps I didn't express my question precisely. I understand that you are
talking about the mmap function in the kernel which is usually a function
pointer in vm_operations...
My question is about the userspace structure of X11. IIUC, we have
On 8/27/23 09:53, Ahmad Nouralizadeh wrote:
Perhaps I didn't express my question precisely. I understand that you are
talking about the mmap function in the kernel which is usually a function
pointer in vm_operations...
My question is about the userspace structure of X11. IIUC, we have X11 cli
Perhaps I didn't express my question precisely. I understand that you are
talking about the mmap function in the kernel which is usually a function
pointer in vm_operations...
My question is about the userspace structure of X11. IIUC, we have X11 clients,
which are GUI apps.They have a portion
On Sun, 27 Aug 2023, Ahmad Nouralizadeh wrote:
Thanks (also Dave and Carsten)! Full of useful information not easily found (if
even found) on the Internet!
You are welcome :)
So, in summary, the communication is done through a series of memory mapped
regions in
the address space of the
Thanks (also Dave and Carsten)! Full of useful information not easily found (if
even found) on the Internet! So, in summary, the communication is done through
a series of memory mapped regions in the address space of the graphics library
(e.g., OpenGL).The image data is transferred 1) from the X
On Sun, 27 Aug 2023, Ahmad Nouralizadeh wrote:
> The framebuffer that is displayed on the monitor is always in video card
> memory. There is a piece of hardware (CRTC) that continuously pulls data
> from the framebuffer and transmits it to the monitor.
So the framebuffer memory should normal
On Sat, 26 Aug 2023 15:28:52 + (UTC) Ahmad Nouralizadeh
said:
> Hi,
> I need to run a set of (graphical) benchmarks with the screen disabled. The
> following command did not work: xset dpms force off
>
> Because any keyboard/mouse input would re-enable the screen. The other option
> was the
> The framebuffer that is displayed on the monitor is always in video card
> memory. There is a piece of hardware (CRTC) that continuously pulls data
> from the framebuffer and transmits it to the monitor.
So the framebuffer memory should normally be in the kernel (Perhaps in special
cases coul
On Sun, 27 Aug 2023, Ahmad Nouralizadeh wrote:
> In order to display anything on the screen the video card needs an array
>of data given color of each pixel. This is usually called "framebuffer"
>because it buffers data for one frame of video.
Thank you for the enlightening explanation! An u
> In order to display anything on the screen the video card needs an array
>of data given color of each pixel. This is usually called "framebuffer"
>because it buffers data for one frame of video.
Thank you for the enlightening explanation! An unrelated question: IIUC the
framebuffer is a share
On Sat, 26 Aug 2023, Ahmad Nouralizadeh wrote:
> > However, I would have expected that VLC would produce a lot
> > GPU/iGPU accesses even without drawing anything, because it would
> > try to use GPU decoder.
For the discrete GPU, the turned off screen requires much smaller bandwidth in
any
> > However, I would have expected that VLC would produce a lot
> > GPU/iGPU accesses even without drawing anything, because it would
> > try to use GPU decoder.
For the discrete GPU, the turned off screen requires much smaller bandwidth in
any benchmark (reduces from 2GB/s to several KB/s). The
On Sat, 26 Aug 2023 20:46:35 +0100, Dave Howorth wrote:
> On Sat, 26 Aug 2023 13:43:21 -0400 (EDT), Vladimir Dergachev wrote:
>
> > On Sat, 26 Aug 2023, Ahmad Nouralizadeh wrote:
> >
> > > >> Those accesses might not stop with just the display off - some
> > > >> applications may keep redrawin
On Sat, 26 Aug 2023 13:43:21 -0400 (EDT), Vladimir Dergachev wrote:
> On Sat, 26 Aug 2023, Ahmad Nouralizadeh wrote:
>
> > >> Those accesses might not stop with just the display off - some
> > >> applications may keep redrawing.
> > Will these accesses cause iGPU or dedicated GPU accesses to th
On Sat, 26 Aug 2023, Ahmad Nouralizadeh wrote:
>> Those accesses might not stop with just the display off - some
>> applications may keep redrawing.
Will these accesses cause iGPU or dedicated GPU accesses to the DRAM? I think
that those redrawings originate from the processor.
>I'm not sur
>> Those accesses might not stop with just the display off - some
>> applications may keep redrawing.
Will these accesses cause iGPU or dedicated GPU accesses to the DRAM? I think
that those redrawings originate from the processor.
>I'm not sure a graphical benchmark will run without a graphical
On Sat, 26 Aug 2023 12:11:03 -0400 (EDT)
Vladimir Dergachev wrote:
> On Sat, 26 Aug 2023, Ahmad Nouralizadeh wrote:
>
> > I want to count the processor-initiated memory accesses. On my 4K
> > display, a huge number of accesses originate from the iGPU and
> > dedicated GPU. I want to exclude thes
On Sat, 26 Aug 2023, Ahmad Nouralizadeh wrote:
I want to count the processor-initiated memory accesses. On my 4K display, a
huge number of accesses originate from the iGPU and dedicated GPU. I want to
exclude these accesses. The IMC counter can
only track the dedicated GPU accesses. Therefo
I want to count the processor-initiated memory accesses. On my 4K display, a
huge number of accesses originate from the iGPU and dedicated GPU. I want to
exclude these accesses. The IMC counter can only track the dedicated GPU
accesses. Therefore, I have to turn the screen off to exclude those
On Sat, 26 Aug 2023 15:28:52 + (UTC)
Ahmad Nouralizadeh wrote:
> I need to run a set of (graphical) benchmarks with the screen
> disabled.
Can I ask why? What is you're trying to accomplish? Somehow affect the
benchmarks? Stop people seeing the benchmarks being performed?
And what is the be
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