Quoting Rodrigo Vivi (2018-07-20 21:22:25) > On Thu, Jul 19, 2018 at 11:31:19PM +0200, Marcin Owsiany wrote: > > Hello, > > TL;DR: how can I set a 8960x2880 screen (not display) size on a T580? A > > patch for i915 that I found on the internets does not seem to work. > > Full story: > > I'm a rather happy user of ThinkPad T580 which comes with a > > high-density 3840x2160 LCD, and the following graphics hardware. > > 00:02.0 VGA compatible controller: Intel Corporation Device 5917 (rev > > 07) (prog-if 00 [VGA controller]) > > Subsystem: Lenovo Device 225a > > Flags: bus master, fast devsel, latency 0, IRQ 142 > > Memory at e7000000 (64-bit, non-prefetchable) [size=16M] > > Memory at c0000000 (64-bit, prefetchable) [size=256M] > > I/O ports at e000 [size=64] > > [virtual] Expansion ROM at 000c0000 [disabled] [size=128K] > > Capabilities: [40] Vendor Specific Information: Len=0c <?> > > Capabilities: [70] Express Root Complex Integrated Endpoint, > > MSI 00 > > Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit- > > Capabilities: [d0] Power Management version 2 > > Capabilities: [100] Process Address Space ID (PASID) > > Capabilities: [200] Address Translation Service (ATS) > > Capabilities: [300] Page Request Interface (PRI) > > Kernel driver in use: i915 > > Kernel modules: i915 > > Unfortunately attaching it to an external normal-density 2560x1440 > > display means I need to apply scaling. Combined with the side-by-side > > arrangement of monitors, this means I'd need to set screen size > > to 8960x2880. However this does not work: > > $ xrandr --fb 8960x2880 > > xrandr: screen cannot be larger than 8192x8192 (desired size > > 8960x2880) > > I found this [1]thread on reddit about the same problem, where a user > > posted a simple patch claimed to be supplied by someone on #intel-gfx. > > Unfortunately it does not work (or at least is not sufficient) - after > > applying it xrandr does claim that 16384x16384 is possible, but > > actually trying to use more than 8192x8192 fails with an error > > (unfortunately I lost the exact message). > > I'm afraid that it is a hardware limitation that you won't be able to > workaround. But a log would be interesting anyway... (both dmesg and xorg.0.log) It is only a hardware limitation for a single pipe. We have supported 32kx32k screens for over 6 years in SNA. -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
