On Tue, Feb 13, 2018 at 09:50:30AM +0100, Pali Rohár wrote: > On Tuesday 06 February 2018 16:21:43 Pali Rohár wrote: > > Hi! I'm periodically getting following message in dmesg on Lenovo > > Thinkpad X1 Carbon 3rd generation: > > > > [drm] Reducing the compressed framebuffer size. This may lead to less power > > savings than a non-reduced-size. Try to increase stolen memory size if > > available in BIOS. > > > > In BIOS I already set GPU size to 512M, but this did not help. Also > > update to last BIOS version did not help. > > > > So why this message is periodically print in dmesg? And what can I do > > with this problem? > > > > And why cannot Linux kernel allocate itself more memory for GPU (if BIOS > > can/could do that)? Is not 512MB for GPU enough? > > And here is output from lspci, which clearly says that 512MB is already > set for GPU:
The PCI BAR size has nothing to do with the size of the stolen memory. The BAR just provides a window into the global GTT address space of the GPU. Stolen memory is a contiguous chunk of physical memory carved out by the BIOS. The BIOS may or may not provide a knob to change the size of the stolen memory. > > $ lspci -v -s 00:02.0 > 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev > 09) (prog-if 00 [VGA controller]) > Subsystem: Lenovo HD Graphics 5500 > Flags: bus master, fast devsel, latency 0, IRQ 46 > Memory at e0000000 (64-bit, non-prefetchable) [size=16M] > Memory at c0000000 (64-bit, prefetchable) [size=512M] > I/O ports at 3000 [size=64] > [virtual] Expansion ROM at 000c0000 [disabled] [size=128K] > Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit- > Capabilities: [d0] Power Management version 2 > Capabilities: [a4] PCI Advanced Features > Kernel driver in use: i915 > Kernel modules: i915 > > -- > Pali Rohár > pali.ro...@gmail.com > _______________________________________________ > dri-devel mailing list > dri-de...@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel -- Ville Syrjälä Intel OTC _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
