我最近决定从内核为 4.9 的 Debian Buster 切换到 Ubuntu。我一开始使用的是 Ubuntu 20.04，发现 YouTube、Zoom 和 Netflix 上的视频卡顿。因此我决定切换到 Ubuntu 18.04，但我遇到了同样的问题，只不过卡顿每 1 分钟发生一次，而不是每 10 秒发生一次。
在 YouTube 上观看视频时，我看到htop我的每个核心都在 10% 到 25% 之间。
我在 Debian 上从未遇到过任何视频问题。而我的两台 ThinkPad、T440 和 T450 都出现了这种情况。
我尝试过的：
- 按照其他线程所建议的方式删除系统监视器。
- 切换到 xfce4。
- 在 Firefox 上禁用硬件解码。
$ uname -a
Linux T450 5.4.0-66-generic #74~18.04.2-Ubuntu SMP Fri Feb 5 11:17:31 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
$ lshw -C video
*-display
description: VGA compatible controller
product: HD Graphics 5500
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:50 memory:e0000000-e0ffffff memory:d0000000-dfffffff ioport:4000(size=64) memory:c0000-dffff
$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09)
$ modinfo i915
name: i915
vermagic: 5.4.0-66-generic SMP mod_unload
signat: PKCS#7
signer:
sig_key:
sig_hashalgo: md4
parm: modeset:Use kernel modesetting [KMS] (0=disable, 1=on, -1=force vga console preference [default]) (int)
parm: enable_dc:Enable power-saving display C-states. (-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6) (int)
parm: enable_fbc:Enable frame buffer compression for power savings (default: -1 (use per-chip default)) (int)
parm: lvds_channel_mode:Specify LVDS channel mode (0=probe BIOS [default], 1=single-channel, 2=dual-channel) (int)
parm: panel_use_ssc:Use Spread Spectrum Clock with panels [LVDS/eDP] (default: auto from VBT) (int)
parm: vbt_sdvo_panel_type:Override/Ignore selection of SDVO panel mode in the VBT (-2=ignore, -1=auto [default], index in VBT BIOS table) (int)
parm: reset:Attempt GPU resets (0=disabled, 1=full gpu reset, 2=engine reset [default]) (int)
parm: vbt_firmware:Load VBT from specified file under /lib/firmware (charp)
parm: error_capture:Record the GPU state following a hang. This information in /sys/class/drm/card<N>/error is vital for triaging and debugging hangs. (bool)
parm: enable_hangcheck:Periodically check GPU activity for detecting hangs. WARNING: Disabling this can cause system wide hangs. (default: true) (bool)
parm: enable_psr:Enable PSR (-1=use per-chip default, 0=disabled [default], 1=enabled) (int)
parm: force_probe:Force probe the driver for specified devices. See CONFIG_DRM_I915_FORCE_PROBE for details. (charp)
parm: alpha_support:Deprecated. See i915.force_probe. (bool)
parm: disable_power_well:Disable display power wells when possible (-1=auto [default], 0=power wells always on, 1=power wells disabled when possible) (int)
parm: enable_ips:Enable IPS (default: true) (int)
parm: fastboot:Try to skip unnecessary mode sets at boot time (0=disabled, 1=enabled) Default: -1 (use per-chip default) (int)
parm: prefault_disable:Disable page prefaulting for pread/pwrite/reloc (default:false). For developers only. (bool)
parm: load_detect_test:Force-enable the VGA load detect code for testing (default:false). For developers only. (bool)
parm: force_reset_modeset_test:Force a modeset during gpu reset for testing (default:false). For developers only. (bool)
parm: invert_brightness:Invert backlight brightness (-1 force normal, 0 machine defaults, 1 force inversion), please report PCI device ID, subsystem vendor and subsystem device ID to [email protected], if your machine needs it. It will then be included in an upcoming module version. (int)
parm: disable_display:Disable display (default: false) (bool)
parm: mmio_debug:Enable the MMIO debug code for the first N failures (default: off). This may negatively affect performance. (int)
parm: verbose_state_checks:Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions. (bool)
parm: nuclear_pageflip:Force enable atomic functionality on platforms that don't have full support yet. (bool)
parm: edp_vswing:Ignore/Override vswing pre-emph table selection from VBT (0=use value from vbt [default], 1=low power swing(200mV),2=default swing(400mV)) (int)
parm: enable_guc:Enable GuC load for GuC submission and/or HuC load. Required functionality can be selected using bitmask values. (-1=auto, 0=disable [default], 1=GuC submission, 2=HuC load) (int)
parm: guc_log_level:GuC firmware logging level. Requires GuC to be loaded. (-1=auto [default], 0=disable, 1..4=enable with verbosity min..max) (int)
parm: guc_firmware_path:GuC firmware path to use instead of the default one (charp)
parm: huc_firmware_path:HuC firmware path to use instead of the default one (charp)
parm: dmc_firmware_path:DMC firmware path to use instead of the default one (charp)
parm: enable_dp_mst:Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true) (bool)
parm: enable_dpcd_backlight:Enable support for DPCD backlight control(-1=use per-VBT LFP backlight type setting [default], 0=disabled, 1=enabled) (int)
parm: enable_gvt:Enable support for Intel GVT-g graphics virtualization host support(default:false) (bool)