Hi Nicolas sorry for the late reply.
Nicolas Pitre schrieb am Sun, Nov 17, 2019 at 02:09:52PM -0500: > On Sun, 17 Nov 2019, Sebastian Humenda wrote: > > Sebastian Humenda schrieb am 05.11.2019, 22:01 +0100: > > >on a freshly installed GNU/Linux system I am experiencing an ‚empty’ > > >screen with BRLTTY. > > >After booting the machine, the braille display is empty and shows only the > > >blinking cursor. The screen shows the normal TTY log in prompt. > > > > I have now had a chance to find out more about the issue. I can reproduce > > this > > both on a Debian 10 with Linux 4.19, or 5.2, as well as on an Ubuntu with > > Linux 5.3. > > As a temporary work-around, I have set the console font from „fixed” to > > terminus in the largest font. I wonder how this might affect /dev/vcsu. > > Are you saying that this workaround "solved" the issue? Yes, it does. > What if you add the following to your brltty.conf instead: > > screen-parameters lx:unicode=no Then I get "no screen" on my display. > # The > > Linux tty uses a framebuffer with an AMD GPU driver. > > What messages related to "Console" or "framebuffer" or "fb0" do you get > from the dmesg command after boot? I've attached the output below. Hopefully this is helpful at all, it was a bit tedious to grep for three different terms :). Thanks! Sebastian === dmesg excerpt === […] [ 0.093033] vt handoff: transparent VT on vt#7 [ 0.093037] Console: colour dummy device 80x25 [ 0.093042] printk: console [tty0] enabled [ 0.093055] ACPI: Core revision 20190703 [ 0.093488] clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635855245 ns [ 0.093553] APIC: Switch to symmetric I/O mode setup […] [ 0.433210] efifb: probing for efifb [ 0.433222] efifb: framebuffer at 0xc0000000, using 14400k, total 14400k [ 0.433223] efifb: mode is 2560x1440x32, linelength=10240, pages=1 [ 0.433223] efifb: scrolling: redraw [ 0.433224] efifb: Truecolor: size=8:8:8:8, shift=24:16:8:0 [ 0.433267] Console: switching to colour frame buffer device 160x45 [ 0.433280] fb0: EFI VGA frame buffer device […] [ 2.776945] amdgpu 0000:65:00.0: remove_conflicting_pci_framebuffers: bar 0: 0xc0000000 -> 0xcfffffff [ 2.776947] amdgpu 0000:65:00.0: remove_conflicting_pci_framebuffers: bar 2: 0xd0000000 -> 0xd01fffff [ 2.776949] amdgpu 0000:65:00.0: remove_conflicting_pci_framebuffers: bar 5: 0xd8e00000 -> 0xd8e3ffff [ 2.776950] checking generic (c0000000 e10000) vs hw (c0000000 10000000) [ 2.776951] fb0: switching to amdgpudrmfb from EFI VGA [ 2.777243] Console: switching to colour dummy device 80x25 [ 2.777254] amdgpu 0000:65:00.0: vgaarb: deactivate vga console [ 2.777284] amdgpu 0000:65:00.0: enabling device (0106 -> 0107) […] [ 3.097386] [drm] fb mappable at 0xC1340000 [ 3.097387] [drm] vram apper at 0xC0000000 [ 3.097387] [drm] size 14745600 [ 3.097387] [drm] fb depth is 24 [ 3.097388] [drm] pitch is 10240 [ 3.097435] fbcon: amdgpudrmfb (fb0) is primary device [ 3.097482] Console: switching to colour frame buffer device 160x45 [ 3.097495] amdgpu 0000:65:00.0: fb0: amdgpudrmfb frame buffer device [ 3.117995] EDAC MC0: Giving out device to module skx_edac controller Skylake Socket#0 IMC#0: DEV 0000:64:0a.0 (INTERRUPT) [ 3.118013] EDAC MC1: Giving out device to module skx_edac controller Skylake Socket#0 IMC#1: DEV 0000:64:0c.0 (INTERRUPT) [ 3.118404] input: HDA Intel PCH Rear Mic as /devices/pci0000:00/0000:00:1f.3/sound/card0/input15 [ 3.118445] input: HDA Intel PCH Front Mic as /devices/pci0000:00/0000:00:1f.3/sound/card0/input16 [ 3.118477] input: HDA Intel PCH Line Out as /devices/pci0000:00/0000:00:1f.3/sound/card0/input17 [ 3.118508] input: HDA Intel PCH Front Headphone as /devices/pci0000:00/0000:00:1f.3/sound/card0/input18 [ 3.138450] [drm] Initialized amdgpu 3.33.0 20150101 for 0000:65:00.0 on minor 0 [ 3.249626] intel_rapl_common: Found RAPL domain package [ 3.249630] intel_rapl_common: Found RAPL domain dram [ 3.249630] intel_rapl_common: DRAM domain energy unit 15300pj [ 3.276836] audit: type=1400 audit(1574758071.210:2): apparmor="STATUS" operation="profile_load" profile="unconfined" name="lsb_release" pid=985 comm="apparmor_parser" [ 3.277110] audit: type=1400 audit(1574758071.210:3): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/snapd/snap-confine" pid=988 comm="apparmor_parser" [ 3.277111] audit: type=1400 audit(1574758071.210:4): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/snapd/snap-confine//mount-namespace-capture-helper" pid=988 comm="apparmor_parser" [ 3.277416] audit: type=1400 audit(1574758071.210:5): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/sbin/ippusbxd" pid=984 comm="apparmor_parser" [ 3.277552] audit: type=1400 audit(1574758071.214:6): apparmor="STATUS" operation="profile_load" profile="unconfined" name="nvidia_modprobe" pid=980 comm="apparmor_parser" [ 3.277555] audit: type=1400 audit(1574758071.214:7): apparmor="STATUS" operation="profile_load" profile="unconfined" name="nvidia_modprobe//kmod" pid=980 comm="apparmor_parser" [ 3.280038] audit: type=1400 audit(1574758071.214:8): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/bin/man" pid=987 comm="apparmor_parser" [ 3.280039] audit: type=1400 audit(1574758071.214:9): apparmor="STATUS" operation="profile_load" profile="unconfined" name="man_filter" pid=987 comm="apparmor_parser" […] _______________________________________________ This message was sent via the BRLTTY mailing list. 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